Abstract

Organic inorganic hybrid perovskites have potential applications in solar cells, electroluminescent device, nanolaser and radiation detection because of their unique optoelectronic properties. In this paper,the perovskite (C4H9NH3)2PbBr4 and (C6H5CH2NH3)2PbBr4 were synthesized by solvent evaporation. The crystal structure, morphology, absorption spectrum, laser power dependence ofthe PL intensity and lifetime were studied. The results show that both two perovskitesare well crystallized and oriented. The absorption peaks are located at 416 nm (2.96 eV) and 392 nm (3.16 eV), the PL peaks are located at 427 nm (2.81 eV) and 415 nm (298 eV) respectively. The PL intensity increases with increasing laser power, but the lifetime decreases with increasing laser power, which is mainly due to the non-geminate recombination.